For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.

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get state$(): Observable<CallCapabilitiesState>

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get state(): CallCapabilitiesState

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capabilities.state$.subscribe((state) => {
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  console.log('state:', state);
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});